References of "Jijakli, Haissam"
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See detailPotential for the use of lactoperoxidase against post-harvest diseases on fruit
Bafort, Françoise ULiege; Perraudin, Jean-Paul; Jijakli, Haissam ULiege

in Acta Horticulturae (in press)

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See detailSurfactin protects wheat against Zymoseptoria tritici and activates both salicylic acid- and jasmonic acid-dependent defense responses
Le Mire, Géraldine ULiege; Siah, Ali; Brisset, Marie-Noëlle et al

in Agriculture (2018), 8

Natural elicitors induce plant resistance against a broad spectrum of diseases, and are currently among the most promising biocontrol tools. The present study focuses on the elicitor properties of the ... [more ▼]

Natural elicitors induce plant resistance against a broad spectrum of diseases, and are currently among the most promising biocontrol tools. The present study focuses on the elicitor properties of the cyclic lipopeptide surfactin on wheat, in order to stimulate the defenses of this major crop against the challenging fungal pathogen Zymoseptoria tritici. The protection efficacy of surfactin extracted from the strain Bacillus amyloliquefaciens S499 was investigated through greenhouse trials. Surfactin protected wheat by 70% against Z. tritici, similarly to the chemical reference elicitor Bion®50WG. In vitro biocidal assays revealed no antifungal activities of surfactin towards the pathogen. A biomolecular RT-qPCR based low-density microarray tool was used to study the relative expression of 23 wheat defense genes. Surfactin significantly induced wheat natural defenses by stimulating both salicylic acid- and jasmonic acid-dependent signaling pathways. Surfactin was successfully tested as an elicitor on the pathosystem wheat–Z. tritici. These results promote further sustainable agricultural practices and the reduction of chemical inputs. [less ▲]

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See detailTaxonomic characterisation of bacteria communities from water of diversified aquaponic systems
Eck, Mathilde ULiege; Sare, Abdoul Razack ULiege; Massart, Sébastien ULiege et al

Poster (2017, December)

In 2030, the world’s population should reach 8.3 billion people. It is thus necessary to find intensive yet sustainable food production methods to feed this growing population and aquaponics could ... [more ▼]

In 2030, the world’s population should reach 8.3 billion people. It is thus necessary to find intensive yet sustainable food production methods to feed this growing population and aquaponics could contribute to it.. Aquaponics is defined as a combination of hydroponic and aquaculture techniques and seems to be a promising technology to meet this resilience. It functions with plants, fish and microorganisms which play a key role in nitrification and mineralisation of fish wastes into nutrients absorbable by plants. Herein we aim at characterising the bacteria present in diversified systems to better understand the composition and role of their communities in aquaponics. To this end, nine diversified aquaponic systems were sampled. The DNA from each bacteria community was extracted and sequenced with Illumina MiSeq technology by targeting the V1-V3 16S rDNA region. The sequences were then analysed with the QIIME bioinformatic software. Results show that Proteobacteria and Bacteroidetes are the dominant phyla for all the aquaponic systems. Depending on each system, different proportions of other phyla are also present among the bacterial community. The genera which compose all the identified phyla are more diverse and an important proportion of them are usually found in soils and rhizosphere. One of the roles that could be linked to these genera is the breaking down of complex organic compounds which could be related to the mineralisation phenomenon observed in aquaponic systems. Further studies should be undertaken to identify the exact species present in aquaponic systems and to understand their specific functions. [less ▲]

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See detailAntifungal effects of volatile organic compounds emitted during infection of barley roots by fungal pathogens
De Clerck, Caroline ULiege; Fiers, Marie; Jallais, Lucie et al

Poster (2017, December)

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See detailBIOCONTROL PROPERTIES OF RECIRCULATING AQUACULTURE WATER AGAINST HYDROPONIC ROOT PATHOGENS
Stouvenakers, Gilles ULiege; Massart, Sébastien ULiege; Jijakli, Haissam ULiege

Conference (2017, October 18)

Integrated recirculated systems combining aquaculture and hydroponic, known as aquaponic systems, are today more and more studied. However one critical management point is still unclear, namely plant pest ... [more ▼]

Integrated recirculated systems combining aquaculture and hydroponic, known as aquaponic systems, are today more and more studied. However one critical management point is still unclear, namely plant pest management. In aquaponics, diseases found in the system are commonly the same than in hydroponics. Root pathogens and more specially oomycetes fungi responsible of root rot are among the most problematic due to their capacity of dispersion linked to zoospores production. On the other hand, compared with hydroponics, aquaponic plants production can give similar yields with less mineral nutrients concentration and even better yields for equivalent concentration in the nutritive solution (Pantanella et al., 2010; Delaide et al., 2016; Saha et al., 2016; Suhl et al., 2016). Furthermore one article opens the hypothesis of an in vitro protective activity of fish effluents versus plant pathogens (Gravel et al., 2015). Both phenomena could be linked to microorganisms or compounds present in fish water. Assumptions that don’t seem aberrant in light of suppressive action already observed in hydroponic systems (Postma et al., 2008). In addition, microorganisms potentially involving in this action could be richer because of organic compounds in aquaponic water. To confirm these observations, in vitro and in vivo experimentations have been made on the ability of recirculating aquaculture water to procure a plant protection effect towards Pythium aphanidermatum (Edson) Fitzp, an oomycetes pathogen. Firsts in vitro results show a significant decrease of mycelium production when 25% of fish water is present in a V8 CaCO3 broth. But no difference was made between the control and the broth containing 25% of 0,2 µm filtrated fish water. These finding highlight a direct microbial antagonist activity of recirculating aquaculture water against P. aphanidermatum. However dissolved compounds don’t display a direct action on this pathogen but biostimulation or elicitation effect on plants can’t be excluded. [less ▲]

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See detailFirst Characterization of the Volatile Organic Compounds Emitted by Banana Plants (Musa sp.)
Berhal, Chadi ULiege; De Clerck, Caroline ULiege; LEVICEK, Carolina et al

Conference (2017, June 16)

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish ... [more ▼]

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety, and Plantain represents that status for the cooking banana group. Despite the importance of the Volatile Organic Compounds (VOCs), which are secondary metabolites with a high vapour pressure, in their utility in the plant protection and communication processes, they were never documented for the plant itself. Thus, the aim of this PHD thesis is to study the VOCs emitted by the plant, rather than their fruits or flowers. A protocol was optimized for the extraction of the banana plant's VOCs. The results of the first analysis showed 11 VOCs for the Cavendish, mainly (E,E)-α-farnesene (87.90 ± 11.28 ng/µl), methyl salicylate (33.82 ± 14.29) and 6-methyl-5-hepten-2-one (29.60 ± 11.66), and 14 VOCs for the Pacific Plantain cultivars, mainly (Z,E)-α-farnesene (799.64 ± 503.15),(E,E)-α-farnesene (571.24 ± 381.70) and (E) β ocimene (241.76 ± 158.49). Most of these compounds belong to the terpenes group (8 for Cavendish, 10 for Pacific Plantain). The other compounds detected were ketones, esters and aldehydes. Eight compounds were common between the two varieties (myrcene, Z and E β-ocimene, 6-methyl-5-hepten-2 one, 6-methyl-3,5-hepadien-2-one, a-farnesene, methyl salicylate and β-ionone). This exploratory study paves the way for an in-depth characterisation of VOCs emitted by Musa plants. [less ▲]

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See detailNew insights into the microbiome of apple fruit surface “cv Pinova” through metagenomics
Dario, Angeli; Massart, Sébastien ULiege; Sare, Abdoul Razack ULiege et al

Conference (2017, June)

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See detailBactericide activity of essential oils and milk’s ions against xyllela fastidiosa
Faivre, Arno; Bafort, Françoise ULiege; Perraudin, Jean-Paul et al

Poster (2017, May 23)

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See detailStudy of volatile organic compounds active against barley pathogens
De Clerck, Caroline ULiege; Kaddes, Amine ULiege; Fiers, Marie et al

Conference (2017, May 23)

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See detailStudy of VOCs in the interaction between Banana and Foc TR4
Berhal, Chadi ULiege; De Clerck, Caroline ULiege; LEVICEK, Carolina et al

Poster (2017, May 23)

Banana fruit (Musa sp.) ranks fourth in term of worldwide production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish ... [more ▼]

Banana fruit (Musa sp.) ranks fourth in term of worldwide production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety. Nowadays, the Cavendish is endangered by the newly emergent race of the Panama disease, caused by the fungal pathogen Fusarium oxysporum f.sp. cubense TR4 (Foc TR4). Despite the importance of the Volatile Organic Compounds (VOCs), which are secondary metabolites with a high vapour pressure, in their utility in the plant protection processes, they were never documented as a way to manage this disease on Cavendish. Thus, the aim of this PhD thesis is to study the VOCs in the specific interaction Cavendish/Foc TR4, as a way to manage this threat. Based on the work previously done with other plants at Gembloux Agro-Bio Tech/University of Liège/Belgium, a protocol was optimized for the extraction of the banana plant’s VOCs. And in parallel, models of in-vitro and in-vivo inoculations are under development, in order to distinguish the root zone from the upper part of the plant in the study. The results of the first analysis showed that the majority of the Cavendish VOCs belongs to the terpenes group, as well as ketones and an organic ester. The identified key VOCs of the interaction will be subject to toxicity tests, in order to determine their effect on the development of the plant and the pathogen. The banana plant is a staple food for more than 400 Million people in the world, while this disease persists as a major threat for its production, and this original study could contribute to the fight against this threatening disease. [less ▲]

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See detailEssential oil of Tunisian plant: biopesticide applied in agricultural system
Ben Kaab, Sofiène ULiege; ksouri, riadh; Jijakli, Haissam ULiege

Conference (2017, May 23)

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt ... [more ▼]

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt and drought) increase production and accumulation of reactive oxygen species (ROS). Consequently, Tunisian plants have developed adaptive responses including the synthesis of specific bioactive molecules used for medical and nutritional purposes (Ksouri et al., 2012). In that context, the main objective of the present study was the identification of essential oils from Tunisian plants against the important plant pathogens, particularly in Europe. The study began with the selection of endemic medicinal plant suspected to present antimicrobial properties. The essential oil was extracted by hydrodistillation using a Clevenger type apparatus (with a yield of 1.2%). The chemical composition of the essential oil obtained by hydro-distillation from the aerial parts was analyzed by GC/MS. Therefore, antifungal activity was evaluated against Fusarium culmorum, Fusarium oxysporum and Penicillium italicum, using ELISA microplates with a blocked randomized design, as described previously (Kouassi et al., 2012). In addition, the essential oil was then tested for their herbicidal activities in pre-emergence and post-emergence assays against three weeds species. The chromatographic analysis showed a complex mixture where twenty compounds were identified accounting for 98.75 % of the total oil. Monoterpenes was represented by 71.73 %. The dominant monoterpenes are α Pinene (7.09%), 1,8-Cineole (54.6%) and Camphor (12.27%). Essential oil reduced significantly spores germination in a dose-dependent manner. Their fungistatic activity reached 100% at 0.6% against Fusarium oxysporum . In the dose response bioassay, the essential oil reduced seed germination rate of Phalaris minor, Sylibum marianum and Trifolium incanatum. Seedling growth was measured by shoot and root lengths at day 7. At 0.5%, essential oil reduced 100% seed germination. Post-emergence bioassays consisted in spraying essential oil at 3 concentrations (0.75, 2 and 3.4 %) at 2 leaves stage of three weeds species. Pelargonic acid was used as commercial positive control at 3.4%. At 0.75% and 2%, the essential oil do not show any sign of injury. However, only at 3.4 %, the spraying of essential oil showed visible injury ranging from wilting (after 1 day) and chlorosis (after 3 day) on Trifolium incanatum and Phalaris minor. After formulation, to enhance the distribution, the coverage and the penetration of the active molecules, the essential oil presented a high herbicidal activity. In conclusion, this work allowed to open new perspectives on the application of Tunisian essential oil as Novel biocontrol strategies against damageable plant pathogens and weeds. [less ▲]

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See detailFirst Characterisation of Volatile Organic Compounds Emitted by Banana Plants
Berhal, Chadi ULiege; De Clerck, Caroline ULiege; Fauconnier, Marie-Laure ULiege et al

in Scientific Reports (2017)

Banana (Musa sp.) ranks fourth in term of worldwide fruit production, and has economical and nutritional key values. The Cavendish cultivars correspond to more than 90% of the production of dessert banana ... [more ▼]

Banana (Musa sp.) ranks fourth in term of worldwide fruit production, and has economical and nutritional key values. The Cavendish cultivars correspond to more than 90% of the production of dessert banana while cooking cultivars are widely consumed locally around the banana belt production area. Many plants, if not all, produce Volatile Organic Compounds (VOCs) as a means of communication with their environment. Although flower and fruit VOCs have been studied for banana, the VOCs produced by the plant have never been identified despite their importance in plant health and development. A volatile collection methodology was optimized to improve the sensitivity and reproducibility of VOCs analysis from banana plants. We have identified 11 VOCs for the Cavendish, mainly (E,E)-α-farnesene (87.90 ± 11.28 ng/μl), methyl salicylate (33.82 ± 14.29) and 6-methyl-5-hepten-2-one (29.60 ± 11.66), and 14 VOCs for the Pacific Plantain cultivar, mainly (Z,E)-α-farnesene (799.64 ± 503.15), (E,E)-α-farnesene (571.24 ± 381.70) and (E) β ocimene (241.76 ± 158.49). This exploratory study paves the way for an in-depth characterisation of VOCs emitted by Musa plants. [less ▲]

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See detailCOMPOSITION COMPRENANT DES IONS I2SCN- ET/OU DES IONS I(SCN)2-
Bafort, Françoise ULiege; Perraudin, Jean-Paul; Jijakli, Haissam ULiege

Patent (2017)

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See detailStrategic Points in Aquaponics
Junge, Ranka; König, Bettina; Villarroel, Morris et al

in Water (2017), 9(182),

Detailed reference viewed: 46 (3 ULiège)